UA147447U - TWO-SCREW VOLUME PRESS - Google Patents

Abstract

Two-pass screws for pulp press contain two parallel horizontal screws, each screw contains a complete second step or the edge of the spiral, identical to the first step or the edge of the spiral on the same screw, both screws are placed in a longitudinal casing or housing and arranged so as not to allow during the free passage of the spirals in the area where they are closest to the two screws; thus, each screw is formed by two steps or edges of a spiral which are at the same distance from the filter casing, and the specified distance is constant and is in the range from one to two millimeters relative to the filter casing or housing in which the pulp is located. The edge of the spiral of both the first step and the second step includes spiral extensions or a scraper / cleaner made by hard alloy surfacing, acting as a blade by moving inside the filter housing, and creating a scraping or cleaning effect that forms the cutting edge of each helix of two screws based on their ends, which form an obtuse angle with the filter casing on the side that compresses the pulp, maintaining a constant distance to the filter casing around its outer perimeter in the range from one to two millimeters.

Description

A useful model belongs to two-screw volumetric presses with two parallel horizontal two-way screws.

The field of application of this useful model is the manufacture of presses widely used in the sugar industry, and the performance of the above presses has been improved by optimizing the cleaning of the accumulated pulp, which blocks the filtering surface, preventing dehydration, mixing and pressure, and also enhances the effect of the labyrinth path, which pulp passes within the press. That is, a geometric seal is created that prevents the product from moving back during pressing.

Horizontal volumetric presses with two parallel screws were invented by the Norwegian company 5TOKO for pressing fish waste for further production of fish meal. Subsequently, they received new applications, among other things, today they are used to press the produced sugar beet pulp at sugar factories.

Thus, in the 1970s, the companies ZTOKO, VAVVIMI 5 S BAZ EI and MEKSIERK itself, associated with this technical solution, supplied these machines to sugar factories all over the world, without introducing any radical innovations into their design over time: mainly , the use of conical screws instead of bi-cylindrical screws, the use of perforated/filter cores in the screws and the installation of small spirals in the pressure zone.

Currently, the output obtained during pressing of the produced sugar beet pulp in the above-mentioned presses determines the following processes of final thermal drying, which provide fuel savings. This heat drying is often done in dryers/rotary kilns where the product is dried until it reaches about 90-95 dry matter, after which it is finally pressed into pellets and sold as cattle feed.

It should also be noted that the above-mentioned horizontal volume presses with two parallel screws are used for other sugar factory waste, such as sugar beet leaves and stalks, for chicory pulp, fish waste, meat waste, for processing waste by-products of agriculture 2 farms, such as soybeans, starch, orange peel, alfalfa, potatoes, etc. and in general for all types of products whose value is increased by the pressing process.

The patent for the invention, which is determined by the publication number and title, respectively, ERO77310081 "Bohem/rge55 Tog depuagayipd irgoi5 taiegiaI5", the owner of which is the company VAVVIMI 5 S ZA EI, provides a press in which a pair of parallel screws with a two-way spiral is provided, where the height of one of the spirals is much smaller than the height of the other. That is, these are screws with a double spiral, where the second spiral is used, the height of which is from 50 to 60 mm, which is significantly less than the height of the first spiral. In addition, these spirals do not have a constant overall height.

In conclusion, "pSoShibie-"iagi (pgeai riir rge55 5sgemu5" provides, in comparison with the general state of the art and in particular, in comparison with the above-mentioned invention of the company VAVVIMI 5 S AB ESHI, a horizontal twin-screw press in which the screws have a double helix of the same height , designed so that the spirals do not touch each other, and that its use, in conjunction with the inclusion of a scraper/cleaning edge on the outer end of the spirals that form the press screws, provides the following advantages or effects which ultimately increase the overall performance of the press.

A. Cleaning effect. This effect is enhanced due to the use of an edge with appropriate geometric properties that give it a high scraping and cleaning ability. In addition, the length of the active edge of the spirals on the filter housing is doubled. This involves a double cleaning of the perforation of the filter jacket, which can be blocked by pulp during the pressing operation, and which is cleaned or released when the auger scrapes the pulp accumulated on the surface.

B. Mixing effect. The ability of a pulp mixer to mix pulp that reaches the auger intersection zone, where the helixes of both augers break up the pulp "packages" or volumes intercepted in that zone when trying to occupy the same space. In this zone, the spirals of both augers attack the "packages" of pulp, breaking them up and, thereby, mixing the pulp. This mixing and redistribution of the pulp prevents the particles from moving in blocks from the beginning to the end of the machine, so that the internal particles are not exposed to the filter jacket, thereby removing the water contained in them.

S. Effect of pressure. The ability of pulp fibers to compress and twist is greatly enhanced due to the greater number of spirals and the fact that they are located closer to each other. This effect takes place in the central area between the two screws. In the specified zone, pressure, twisting and pressing of pulp fibers, which are very beneficial for removing water from the inside, occur between the spiral profiles of different screws, when rotating counter-clockwise very close to each other and when the product is sandwiched between them. r. The labyrinth effect. The blockage of the movement paths in which the product can move in the opposite direction due to the pressure difference when the product is compressed is significantly increased. Thus, in the area located between the two screws, the spirals pass so close to each other that any movement of the pulp between steps or branches of the spiral is limited.

The basis of the useful model is the task of making two-way augers for a pulp press, which contain two parallel horizontal augers.

Double-entry augers for pulp presses contain two parallel horizontal screws, each auger containing a complete second entry or helix edge identical to the first entry or helix edge on the same auger, the two augers being enclosed in a longitudinal casing or housing and arranged so as to avoid collision during the free passage of the spirals in the zone where they are closest to the two screws; thus, each auger is formed by two steps or edges of the helix, which are equidistant from the filter casing, and the specified distance is constant and is in the range of one to two millimeters relative to the filter casing or housing in which the pulp is located. The helix edge of both the first pass and the second pass contains a carbide-tipped spiral extension or scraper/cleaner that acts as a blade along its path of travel within the filter housing and creates a scraping or scouring effect that forms the cutting edge of all the helices of each of two screws based on their ends, which form an obtuse angle with the filter housing itself on the side that compresses the pulp, maintaining a constant distance to the filter housing along its entire outer perimeter in the range of one to two millimeters.

As previously stated, the second spiral step or edge is identical to the first spiral step or edge, the two spiral steps being presented in a longitudinal casing or body and positioned so as not to collide during the free passage of the spirals in the area in which the two screws are closest to each other. Therefore, each screw is made according to the two measures or edges of the helix at the same distance from the filter housing, which is constant, and after installation on the volumetric press, the indicated distance is in the range of

From one to two millimeters from the filter housing or housing in which the pulp is located.

Additionally, both the first pass and second pass spiral edges contain a spiral extension or scraper/cleaner made of abrasion resistant carbide surfacing and acting as a blade along its path of travel within the filter housing based on the ends forming an obtuse angle with the filter housing itself , and which create a scraping or cleaning effect, with the formation of a cutting edge of all the spirals of each of the two screws on the side that compresses the pulp, maintaining a constant distance along its entire outer perimeter. Therefore, since the path of each spiral inside the filter housing maintains a minimum distance to the filter housing itself, which is in the range of one to two millimeters, the scraping/cleaning and release effect is optimized, which is important for the removal of water through the filter housing itself, which is normally prevented from clogging its through holes with the pulp itself, which is pressed. 4

Drawings explain the essence of a useful model.

In Fig. 1 shows the main view in section of "two-way screws for a pulp press";

In Fig. 2 shows the main view in section of "two-way screws for a pulp press" inside a horizontal volume press with two parallel horizontal screws;

In Fig. C shows a detailed view of the scraping/cleaning edge of the "two-way pulp press screws" along the path of the spiral inside the filter casing.

The following components can be distinguished in the above-mentioned figures: 1. Spirals of the first pass 2. Spirals of the second pass 3. Parallel horizontal screws 4. Filter housing 5. Edge of the spiral with a scraping/cleaning effect 6. Pulp 7. Zone of the filter housing with reduced dehydration 8. Zone of the filter jacket with increased dehydration

As an example of a better embodiment of the "Twin-screw volumetric press", with reference to fig. 1 and 2, it can be seen that a system of screws with a double spiral with two parallel horizontal screws (3) is used, where in addition each screw contains a second step or edge (2) of the spiral identical to the first step or edge (1) of the spiral. In other words, each auger is made according to two measures (1, 2) of the helix presented inside the longitudinal casing (4) or the body, at the same constant distance relative to the inner part of the longitudinal casing (4) itself, so that they are within the limits of its diameter inside filter casing (4). The specified minimum distance is in the range of one to two millimeters.

In fig. C shows the edge (1) of the helix with an abrasion-resistant scraper/cleaner (5) having the same configuration as the helixes (2) of the second approach. 5.

During its natural movement, the steps or edges (1, 2) of the spiral move the pulp (6) with a scraper/cleaner (5), accordingly cleaning the layer (b) of the pulp, which blocks the perforated surface of the filter housing (4) and delimits the previous zone of the filter housing (4 ) along its path, where dehydration is reduced (7), followed by another zone where dehydration is increased (8).

In order to evaluate the results, the outputs obtained in the same horizontal volumetric press with two parallel horizontal screws are compared through certified tests in a sugar factory where two single-feed screws are used, with the screws that are the subject of this utility model; an increase in the content of dry matter by 2-2.5 g is obtained.

For a comprehensive analysis of the obtained results, it should be taken into account that the pulp press under operating conditions worse than optimal gives 20-24 95 dry matter, while under optimal conditions it gives 30-34 95 dry matter, demonstrating an increase in the proportion of dry matter obtained by 2- 2.5 95.

This is a very relevant increase, «t 18 95 pressing performance, considering that the range of pressing performance is 20-34 95.

Therefore, as a conclusion, there is a significant increase in the productivity of mechanical pressing and the drying process of the produced pulp of sugar beet, which implies a significant saving of costs for producers in terms of the fuel required for the final thermal drying of the pressed pulp.

In an alternative embodiment, it is possible to provide double spirals (2) in only one section of each of the two screws, so that they are at the same time identical to the first spiral (1) so that they are within the diameter inside the filter casing (4) at a minimum distance from it, which is from one to two millimeters.

Similarly, in another alternative embodiment, the improvement described in this utility model can be used to incorporate it into horizontal volumetric presses with three or, typically, more than two parallel screws.

It is believed that this description is sufficient for one skilled in the art to understand the scope of the useful model and the advantages it provides, and therefore there is no need to continue this description. The elements that make up the utility model, their sizes, shapes or methods of application may be changed, provided that this does not involve changing the essence of the utility model.

Claims (1)

USEFUL MODEL FORMULA Double-entry augers for pulp presses, comprising two parallel horizontal screws, each auger containing a complete second entry or helix edge identical to the first entry or helix edge on the same auger, both augers being enclosed in a longitudinal casing or housing and arranged so as not to to allow collisions during the free passage of spirals in the zone where they are closest to the two screws; thus, each auger is formed by two steps or edges of the helix, which are equidistant from the filter housing, and the specified distance is constant and is in the range of one to two millimeters relative to the filter housing or the housing in which the pulp is located, which differ in that that the edge of both the first pass and the second pass spirals contain carbide-tipped spiral extensions or scrapers/scrubbers that act like a blade along their path of travel within the filter housing and create a scraping or scouring effect that forms the cutting edge of all spirals of each of the two screws based on their ends, which form an obtuse angle with the filter casing itself on the side that compresses the pulp, maintaining a constant distance to the filter casing along its entire outer perimeter in the range of one to two millimeters.